How do you find least distance of distinct vision? (OR) What is the least distance a person can see an object comfortably and distinctly known as ? Write an activity to find that (least, distance of distinct vision) distance.

How do you find least distance of distinct vision? (OR) What is the

1.	How do you find least distance of distinct vision? (OR) What is the least distance a person can see an object comfortably and distinctly known as ? Write an activity to find that (least, distance of distinct vision) distance.
Answer» The least distance a person can see an object comfortably and distinctly is known as least distance of distinct vision. Hold the textbook at certain distance with your hands. Try to read the contents on the page. Gradually move the book towards eye, till it reaches very close to your eyes. You may see that printed letters on the page appear blurred or you feel strain to read. Now move the book backwards to a position where you can see clear printed letters without strain. Ask your friend to measure distance between your eye and textbook at this position. Note down its value. Repeat this activity with other friends and note down the distances for distinct vision in each case. Find the average of all these distances of clear vision. You will notice that to see an object comfortably and distinctly, you must hold it at a distance about 25 cm from your eyes. This 25 cm distance is called least distance of distinct vision. This value varies from person to person and with age